The AS440 is an analogue, 2-phase sensing, self-excited automatic voltage regulator (AVR). The AS440 incorporates Surface Mount Technology (SMT) to its design.

The AS440 is supplied as standard to the STAMFORD® S4 and STAMFORD® HC5 alternators and is an option for the STAMFORD® UC22 and UC27 alternators.

Technical specification:

SENSING INPUT

• Voltage: Jumper selectable, 100-130 Vac 1 phase or 190-264 Vac 1 phase

• Frequency: 50-60 Hz nominal

POWER INPUT

• Voltage: 100-264 Vac 1 phase

• Frequency: 50-60 Hz nominal

OUTPUT

• Voltage: 82V dc at 200V ac 

• Current: continuous 4A dc, Intermittent 7.5 A for 10 secs

• Resistance: 15 ohms min (10 ohms min when input volts is less than 175 ac)

REGULATION

• +/- 1.0% 

THERMAL DRIFT

• 0.03% per deg. C change in AVR ambient

TYPICAL SYSTEM RESPONSE

• AVR response: 20 ms

• Filed current to 90%: 80 ms

• Machine Volts to 97%: 300 ms

EXTERNAL VOLTAGE ADJUSTMENT

• +/-10% with 1 k ohm 1 watt trimmer

• Increasing resistance lowers voltage

UNDER FREQUENCY PROTECTION

• Set point: 94-98% Hz 

UNIT POWER DISSIPATION

• 12 watts maximum

ENVIRONMENTAL

• Vibration: 20-100 Hz 50mm/sec

                  100Hz – 2kHz 3.3g

• Operating temperature: -40 to +70°C

• Relative Humidity: 0-70°C 95%  

• Storage temperature: -55 to +80°C

NOTES

1) De-rate by 12% if mounted in 'portrait' orientation. 

2) With 4% engine governing. 

3) After 2 minutes. 

4) Generator de-rate may apply. Check with factory. 

5) Factory set, semi-sealed, jumper selectable. 

6) Any device connected to the analogue input must be fully floating (galvanically isolated from ground), with an insulation strength of 500V ac. 

7) De-rate output current by 5% per degree C above 60C. 

8) Non condensing.